One-note comic disasters, unconvincing panto villains, children who set your teeth on edge … some characters are so awful they’re painful to watch. We round up the worst

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ometimes, all it takes to change your relationship to a TV show is one character. Viewers are all enjoying the One Day-meets-High Fidelity vibes of BBC Two’s nostalgic romance Mix Tape. However, none of them can stand the cassette-crossed lovers’ spouses. Yes, for every role that becomes a firm viewer favourite, another is reviled by the show’s fanbase. Lena Dunham’s latest creation, Too Much, seems to be entirely populated by unappealing characters.

Meanwhile, Peppa Pig devotees are in a porcine pickle over the imminent onscreen arrival of a new little sister, baby piglet Evie. Cartoon swine devotees fear this gimmicky addition will upset the delicate balance of the four-way family unit that has been beloved by preschoolers for 21 years. If the oinking blockbuster ain’t broke, why fix it?

The current hate figures won’t be the last to spoil a successful programme. We name and shame the unlucky 13 characters who ruined TV shows …